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Using StreamReceiver to Receive an Incoming Data Stream

To receive an upload from the client, we need to register a StreamReceiver that accepts a URL to handle receiving an upload stream.

To create a StreamReceiver, we first need to create a StreamVariable that monitors and controls terminal upload during the time it is being streamed.

Then the stream can be registered through the Element API.

StreamReceiver streamReceiver = new StreamReceiver(
    getElement().getNode(), "upload", getStreamVariable());
getElement().setAttribute("target", streamReceiver);